Psychonauts came in a neat file called psychonauts-linux-06042012-bin. The file system calls it an executable, but I can't find a way to execute it. Ubuntu suggested using "PyPar2" to open it like an archive, which made it into a bunch of .par2 files, but it then couldn't find anything else to open those. It seems that other people have been able to start the game, so what should I do differently?